Checking voltage supply of fuel pump, engine codes CBAA, CBAB, CBBB, CBAC — VW
Checking voltage supply of fuel pump, engine codes CBAA, CBAB, CBBB, CBAC on VW: 14 steps, engines CBAA, CBAB, CBAC, CBBB.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Passat CC (357, 2008–2012)
- Special tools named: VAS 5565
- Renewed: fuel delivery unit
Don't miss
- Switch on ignition. The fuel pump must be heard to run for about 2 seconds.
- The fuel pump is now activated for 30 seconds.
📐 48 workshop diagrams for CBAA
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Remove bench seat General body repairs, interior 72. Rear seats; Removing and installing bench seat / individual seats.
- Detach carpet under seats and fold it back. General body repairs, interior 70. Interior trim; Assembly overview - foot support and floor covering
- Remove cover from fuel delivery unit (see the separate procedure).
- Switch on ignition. The fuel pump must be heard to run for about 2 seconds.
- Switch off ignition.
- Pull connector off fuel delivery unit flange.
- Connect test instrument adapter/DSO (5-pin)VAS 5565 between connector and flange.
- Connect hand-held multimeter V.A.G 1526D to contacts (1) and (5) of adapter.
- Connect Vehicle diagnosis tester and perform guided function "“Fuel pump activation (Checking fuel pump)”". [Note: The fuel pump is now activated for 30 seconds.]
- Read voltage value on hand-held multimeter V.A.G 1526D: specification approx. battery voltage.
- Check activation of fuel pump relay and wiring for an open or short circuit (see the separate procedure).
- Remove fuel delivery unit (see the separate procedure).
- Check that the electrical lines between flange and fuel pump are connected and have continuity.
- Renew fuel delivery unit (see the separate procedure).
Ask TorqFix about your VW CBAA — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.
Ask about your VW CBAA — free → or sign up free to see the drawingsOther VW procedures
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix → · How these pages are made →Workshop data on this page last updated 20 Sep 2026.